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    • 4. 发明公开
    • Process for the preparation of vinyl ethers
    • Verfahren zur Herstellung vonVinyläthern。
    • EP0254976A1
    • 1988-02-03
    • EP87110281.0
    • 1987-07-16
    • ENICHEM ANIC S.p.A.
    • Messina, GiuseppeMoretti, Mario DomenicoSanna, Salvatore RobertoSoma, GiovanniCabras, Pier Gianni
    • C07C43/16C07C43/166C07C45/88C07C41/28
    • C07C41/01C07C2601/16C07C43/17C07C43/188C07C43/166
    • A process for the synthesis of vinyl ethers of formula I
      wherein
      R₁ and R₂, each independently, represent hydrogen or a primary, secondary or tertiary alkyl group,
      R₃ is hydrogen, a primary alkyl, phenyl, or substituted phenyl group, or
      R₂ and R₃, taken together, represent a polymethylene chain containing from 3 to 10 carbon atoms wherein one or more hydrogens can be replaced by methyl or ethyl groups, and
      R is a primary, secondary or tertiary alkyl group, which comprises reacting a suitably selected dioxolane derivative of formula II
      wherein
      R₁, R₂, and R₃ are as defined above, and
      R₄, R₅, R₆, and R₇, each independently, represent hydrogen or an alkyl group,
      with a boric acid ester of formula III
      B(OR)₃ III
      wherein
      R is as defined above,
      in the vapor phase, at a temperature comprised between 100 and 400 °C, and in the presence of an acidic heterogeneous catalyst.
    • 用于合成式I的乙烯基醚的方法其中R 1和R 2各自独立地表示氢或伯,仲或叔烷基,R 3是氢,伯烷基,苯基或取代的苯基,或 R2和R3一起表示含有3至10个碳原子的多亚甲基链,其中一个或多个氢可以被甲基或乙基代替,并且R是伯,仲或叔烷基,其包括使适当选择的 式II的二氧杂环戊烷衍生物其中R 1,R 2和R 3如上所定义,并且R 4,R 5,R 6和R 7各自独立地代表氢或烷基,与式IIIB的硼酸酯( OR)3 III,其中R如上所定义,在气相中,在100-400℃的温度下和在酸性多相催化剂存在下。
    • 5. 发明公开
    • A method of preparing low or medium-densitity straight-chain polyethylene
    • 一种用于低或中密度的直链聚乙烯的制备方法。
    • EP0243327A1
    • 1987-10-28
    • EP87830149.8
    • 1987-04-16
    • ENICHEM ANIC S.p.A.
    • Mirra, MauroMasi, FrancescoInvernizzi, RenzoBani, Antonio
    • C08F210/02C08F4/64
    • C08F210/02Y02P20/52C08F4/6555
    • ow or medium-density straight-chain ethylene polymers are prepared by copolymerising ethylene with a C 4 -C 6 alpha-olefin at elevated temperature and pressure in a tubular reactor and in the presence of a Ziegler-type catalyst comprising a trialkyl aluminium as co-catalyst and a solid component, the solid component being obtained:

      - by spray-drying an ethanolic solution of magnesium chloride to obtain a solid substrate of magnesium chloride particles containing alcoholic hydroxylis,
      - by reacting the substrate with titanium tetrachloride to form an activated substrate, and
      - by reacting the activated substrate with an alkyl aluminium chloride to chlorinate the titanium and partially or completely reduce the titanium from the tetravelent to the trivalent state.
    • 低或中密度的直链乙烯聚合物是通过在升高的温度下的C 4 -C 6α-烯烃和压力下,在管式反应器,并在齐格勒型催化剂存在下,包括三烷基铝作为助催化剂使乙烯制备 和固体成分,固体成分而得到: - 通过的氯化镁,得到氯化镁颗粒的含醇hydroxylis固体基材的乙醇溶液的喷雾干燥, - 通过用四氯化钛使下基片,以形成活化的基底,和 - 通过与烷基氯化铝起反应的活化的底物,以氯化钛和部分或完全呼叫从tetravelent到三价状态还原钛。